大象工程（石頭剪刀布PK遊戲）

因爲採用了隨機數，因此每次編譯結果都不同，結果我就不附圖了。

public class Elephant {
    /*
     * 大象工程
     * 1.打開冰箱門
     * 2.大象PK
     * 3.把贏的大象放進冰箱
     * 4.關閉冰箱門
     * */

    public static void main(String[] args) {
        System.out.println("大象工程啓動：");
        //準備兩頭大象，一臺冰箱
        String elephantA = "大象A";
        String elephantB = "大象B";

        //打開冰箱門
        System.out.println("    1.打開冰箱門");

        //大象pk
        //石頭剪刀布，石頭1>剪刀2>布3>石頭1，用數字代替字符
        //採用Math函數的Math.random()產生3之內的隨機數,(int)(Math.random()*3+1)
        System.out.println("    2.大象pk");
        //採用do.while循環，當出現平局時能夠繼續pk
        String winElephant = null;
        int i = 0;
        do {
            i++;
            int elephantNumA = (int) (Math.random() * 3 + 1);
            int elephantNumB = (int) (Math.random() * 3 + 1);

            //pk開始
            //採用switch將數字和字符對應起來
            String elephantNameA = null;
            String elephantNameB = null;

            switch (elephantNumA) {
                case 1:
                    elephantNameA = "石頭";
                    break;

                case 2:
                    elephantNameA = "剪刀";
                    break;

                case 3:
                    elephantNameA = "布";
                    break;

                default:
                    System.out.println("錯誤！");
                    break;
            }

            switch (elephantNumB) {
                case 1:
                    elephantNameB = "石頭";
                    break;

                case 2:
                    elephantNameB = "剪刀";
                    break;

                case 3:
                    elephantNameB = "布";
                    break;

                default:
                    System.out.println("錯誤！");
                    break;
            }

            System.out.println("        "+"第"+i+"場"+"   "+elephantA+"-"+elephantNameA+" PK "+elephantB+"-"+elephantNameB);

            //三種狀況：A贏，B贏，平局
            if (elephantNumA == 1 & elephantNumB == 2 || elephantNumA == 2 & elephantNumB == 3 || elephantNumA == 3 & elephantNumB == 1) {
                System.out.println("            "+elephantA + "贏了");
                winElephant = elephantA;
            } else if (elephantNumA == elephantNumB) {
                System.out.println("            "+"平局");
            } else {
                System.out.println("            "+elephantB + "贏了");
                winElephant = elephantB;
            }
        } while (winElephant == null);

        //勝利的進入冰箱
        System.out.println("    3.把"+winElephant+"放進冰箱");

        //關閉冰箱門，結束
        System.out.println("    4.關閉冰箱門");
        System.out.println("大象工程結束！");
    }
}